Prymnesium nemamethecum

Taxonomy:

Catalog entries: Prymnesium nemamethecum

Original description: Cells elongate (8-18.5 µm x 6-11 µm), not compressed, being obliquely truncate anteriorly and posteriorly metabolic. Appendages subapically inserted in a depression and comprise two hererodynamic, subequal to unequal flagella (16-25 µm and 9.5-20 µm) and a short, noncoiling, but flexible. haptonema (2.5-6.3 µm). Cells covered by numerous. randomly scattered, muciferous bodies, and by three scale types. Up to six layers of proximal body scales occur. These proximal body scales are large, oval plate scales (0.84 µm x 0.6 µm), with proximal radiating ridge (about 30 per quadrant), and distally an inflexed rim and secondary coronate ornamentation on top of the radiating fibrils. The single distal scale layer consists of elliptical scales (0.65 µm x 0.34 µm) with proximal radiating ridge (about 20 per quadrant), which are also evident on the distal surface. The distal surface is further elaborated by a peripheral, upright wall and a long, central thickening that gives rise to alternating side branches. The third scale type is a simple plate scale (0.61 µ x 0.31 µm) with radiating ridges both proximally and distally (abut 20 per quadrant), but distally also having an inflexed, narrow rim and a small, central thickening. These cales may be distally concave along their long axis and occur only in the anterior region of appendage insertion, around the haptonema. Cells exhibit a smooth swimming behavior with the flagella directed posteriorly. Cells move forward revolving around the long axis with the anterior pole describing a wider helix. Two golden-orange, lobed chloroplasts, each with an obvious pyrenoid, lie parietally along the length of the cell. Other cell contents include the median nucleus between the chloroplasts, the parabasal Golgi body. an anterior vacuole, and scattered lipid droplets.

Morphology:

Cultures: Strains of this species are maintained in culture, for details see Roscoff Culture Collection.

Geological Range:
Last occurrence (top): Extant. Data source:
First occurrence (base): within No known fossil record modern (0.00-0.00Ma, base in "Holocene" stage). Data source:

Prymnesium nemamethecum compiled by Jeremy R. Young viewed: 16-5-2025 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=20395 Go to Archive.is to create a permanent copy of this page - citation notes

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